EP2108529B1 - Tire for motorbike - Google Patents

Tire for motorbike Download PDF

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Publication number
EP2108529B1
EP2108529B1 EP07859837A EP07859837A EP2108529B1 EP 2108529 B1 EP2108529 B1 EP 2108529B1 EP 07859837 A EP07859837 A EP 07859837A EP 07859837 A EP07859837 A EP 07859837A EP 2108529 B1 EP2108529 B1 EP 2108529B1
Authority
EP
European Patent Office
Prior art keywords
tread
tire
loss tangent
regions
tread portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07859837A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2108529A4 (en
EP2108529A1 (en
Inventor
Kouji Terada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of EP2108529A1 publication Critical patent/EP2108529A1/en
Publication of EP2108529A4 publication Critical patent/EP2108529A4/en
Application granted granted Critical
Publication of EP2108529B1 publication Critical patent/EP2108529B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
    • B60C11/005—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
    • B60C11/005—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers
    • B60C11/0058—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers with different cap rubber layers in the axial direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0025—Modulus or tan delta
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/10—Tyres specially adapted for particular applications for motorcycles, scooters or the like

Definitions

  • the present invention relates to a pneumatic tire for a motorcycle including a pair of bead portions having bead cores embedded therein, a pair of sidewalls extending on the outer side in the tire radial direction from the bead portions, and a tread portion extending over the respective sidewall portions and, in particular, a pneumatic tire for a motorcycle for use in running on a dry road surface at a relatively high speed.
  • the present invention aims at improving gripping performance in cornering and durability at a relatively high speed in running straight of the pneumatic tire for a motorcycle.
  • Driving force of a pneumatic tire for a motorcycle is determined, when the tire is running straight, by traction performance thereof.
  • Good traction performance can be attained by constituting, a tread portion of the tire, of a rubber having relatively large elastic modulus, rubber hardness and relatively small loss tangent.
  • a pneumatic tire for a motorcycle effects cornering by banking in cornering situation. During such cornering as this, mainly a shoulder region of the tread portion is brought into contact with a road surface and friction force between the shoulder region and the road surface resists against centrifugal force to effect balancing, whereby cornering is achieved.
  • Such friction force as described above correlates with gripping performances of a pneumatic tire for a motor cycle.
  • a pneumatic tire for a motorcycle comprising a tread portion constituted of three tread regions, i.e. a center tread region including the tire equatorial plane and two shoulder tread regions located to interpose the center tread region therebetween, wherein the center tread region is formed of rubber having relatively small loss tangent and the shoulder tread regions are formed of rubber having relatively large loss tangent, so that heat generation is suppressed, while good gripping performance is ensured by the rubber having relatively large loss tangent in cornering situation and good traction performance is ensured by the rubber having relatively small loss tangent in running straight.
  • a pneumatic tire for a motorcycle comprising a tread portion constituted of three tread regions, i.e. a center tread region including the tire equatorial plane and two shoulder tread regions located to interpose the center tread region therebetween, wherein the center tread region is formed of rubber having relatively small hysteresis loss and the shoulder tread regions are formed of rubber having relatively large hysteresis loss, so that generation of heat in the center tread region is suppressed, while good gripping performance is ensured by the rubber having relatively large hysteresis loss in cornering situation and good traction performance is ensured by the rubber having relatively small hysteresis loss in running straight
  • an object of the present invention is to provide a pneumatic tire for a motorcycle, in which durability at a relatively high speed in running straight is enhanced with maintaining good gripping performances in cornering situation by optimizing the distribution of loss tangent in tread rubbers constituting a tread portion.
  • the present invention provides a pneumatic tire for a motorcycle as claimed in claim 1.
  • a pneumatic tire for a motorcycle since the distribution of loss tangent of the rubbers constituting the tread portion is optimized, generation of heat at the rubbers is suppressed, with retaining good gripping performance in cornering situation, whereby a trouble in the tread portion due to excess heat generation in the rubbers can be effectively prevented and durability at a relatively high speed in running straight can be sufficiently enhanced.
  • "loss tangent” represents loss tangent (tan ⁇ ) expressed as a ratio of loss modulus with respect to dynamic modulus and such a loss tangent was measured by using a spectrometer manufactured by Ueshima Seisakusho Co., Ltd. under the conditions of the initial elongation rate being 6%, the strain rate under vibration being 4%, and frequency being 52 Hz.
  • a rubber of a tread region disposed in the outer side in the tire widthwise direction has the larger loss tangent.
  • the loss tangent of each of the rubbers constituting said other tread regions is preferably in the range of 105 to 150% of the loss tangent of the rubber constituting the center tread region.
  • the tread portion is constituted of the center tread region, two shoulder tread regions each including a ground contact end of the tread portion, and two intermediate tread regions interposed by the center tread region and the respective shoulder tread regions.
  • the width of the center tread region is in the range of 0.15 to 0.35 times as wide as the tread width
  • the sum of the widths of the two intermediate tread regions is in the range of 0.25 to 0.80 times as wide as the tread width
  • the sum of the widths of the two shoulder tread regions is in the range of 0.05 to 0.40 times as wide as the tread width.
  • a "tread width” and a "width of a tread region” each represent a corresponding distance in a section of a tread in the tire widthwise direction, measured along a periphery of the tread portion.
  • the loss tangent of each of the rubbers constituting the shoulder tread region is preferably in the range of 105 to 135% of the loss tangent of each of the rubbers constituting the intermediate tread portions.
  • a pneumatic tire for a motorcycle in which durability at a relatively high speed in running straight is enhanced with maintaining good gripping performance in cornering situation by optimizing the distribution of loss tangent of tread rubbers constituting a tread portion.
  • Fig. 1 is a sectional view in the tire widthwise direction of a representative tire according to the present invention.
  • Fig. 1 is a sectional view in the tire widthwise direction of a representative pneumatic tire for a motorcycle according to the present invention (which tire will be referred to as "tire” hereinafter).
  • Fig. 2 is a perspective view of a section in the tire widthwise direction of the tire as shown in Fig. 1 .
  • Figs. 3 to 5 are sectional views in the tire widthwise direction of other tires according to the present invention.
  • Each of the tires as shown in Fig. 1 and Fig. 2 includes a pair of bead portions 1 having bead cores embedded therein, a pair of sidewalls 2 extending on the outer side in the tire radial direction from the bead portions 1, and a tread portion 3 extending over the respective sidewall portions 2.
  • the tread portion 3 is constituted of at least four tread regions 5, 6 such that, when the tread regions are viewed in a section in the tire widthwise direction, loss tangent values of rubbers constituting the adjacent tread regions are different from each other.
  • the center tread region 5 as a tread region including the tire equatorial plane 4, of the tread regions 5 and 6, is constituted of rubber having loss tangent smaller than that of rubber constituting each of other tread regions 6.
  • "loss tangent" prescribed as above is defined under the condition of 100 °C because a tread portion 3 of a tire for use in running at a relatively high speed as used in racing experiences a high rubber temperature in a range of, e.g. 80 to 100 °C, in running at a relatively high speed.
  • a rubber of a tread region disposed in the outer side in the tire widthwise direction has the larger loss tangent because, in a cornering situation using a relatively large camber angle, the more banking of a motorcycle, the more the tread region disposed on the outer side in the tire widthwise direction is brought into contact with a road surface and, in such a situation, if the loss tangent in the ground contact area is not sufficiently large, the ground contact area of the tread does not generate sufficient heat and the temperature in the area fails to rise up to the temperature range required for demonstrating good gripping performance.
  • the loss tangent of each of the rubbers constituting other tread regions 6 is preferably in the range of 105 to 150% of the loss tangent of the rubber constituting the center tread region.
  • the loss tangent of each of the rubbers constituting said other tread regions 6 is smaller than 105 % of the loss tangent of the rubber constituting the center tread region 5
  • the loss tangent of each of said other tread regions 6 is so small that other tread regions 6 fail to generate sufficient heat in cornering situation and the temperature in these regions do not rise up to the temperature range required for demonstrating good gripping performance, whereby sufficient gripping performance may not be obtained, although such small loss tangent may rather suppress heat generation in other tread regions 6 in cornering situation and thus prevent a trouble due to excess heat generation from occurring.
  • the tread portion 3 is constituted of the center tread region 5, two shoulder tread regions 7 each including a ground contact end of the tread, and two intermediate tread regions 8 interposed by the center tread region 5 and the respective shoulder tread regions 7.
  • the rubber constituting the center tread region 5 has the smallest loss tangent among the rubbers constituting the tread regions and sufficiently retains good traction performance and a good heat-releasing effect when the tire runs straight, it is then necessary to dispose rubbers constituting the tread regions such that the more a motorcycle effects banking in cornering situation, the larger the loss tangent at the ground contact area of said other tread regions becomes, i.e.
  • a rubber of a tread region on the outer side in the tire widthwise direction has the larger loss tangent, in order to increase the temperature at the tread region up to the temperature range required for attaining good gripping performance, to ensure good gripping performance.
  • the width of the center tread region 5 is preferably in the range of 0.15 to 0.35 times and more preferably 0.20 to 0.30 times as wide as the tread width.
  • the sum of the widths of the two intermediate tread regions 8 is preferably in the range of 0.25 to 0.80 times and more preferably 0.35 to 0.70 times as wide as the tread width.
  • the sum of the widths of the two shoulder tread regions 7 is preferably in the range of 0.05 to 0.40 times and more preferably 0.08 to 0.30 times as wide as the tread width.
  • the loss tangent of the rubber constituting each shoulder tread region 7 is preferably in the range of 105 to 135% and more preferably 105 to 125% of the loss tangent of the rubber constituting each intermediate tread region 8.
  • the loss tangent of the rubber constituting each shoulder tread region 7 exceeds 135% of the loss tangent of the rubber constituting each intermediate tread region 5 (8), when the shoulder tread region 7 is brought into contact with a road surface in cornering situation, the loss tangent of the shoulder tread region 7 is so large that the temperature at the shoulder tread region 7 rises up excessively, whereby break of the shoulder tread region 7 due to this excess heat generation may occur.
  • the loss tangent of the rubber constituting each shoulder tread region 7 is smaller than 105% of the loss tangent of the rubber constituting each intermediate tread region 8, when the shoulder tread region 7 is brought into contact with a road surface in cornering situation, the loss tangent of the shoulder tread region 7 is so small that the shoulder tread region 7 fails to generate heat sufficiently and the temperature at the shoulder tread region 7 does not rise up to the temperature range required fro demonstrating good gripping performance, whereby satisfactory gripping performance may not be obtained.
  • the tread portion 1 may be constituted of the intermediate tread regions 8, on the left and right sides of the tire, formed of rubber having relatively large loss tangent and the center tread region 5 interposed by the respective intermediate tread regions 8 and formed of rubber having loss tangent smaller than that of rubber constituting the intermediate tread regions 8, wherein the shoulder tread region 7 may be provided or laminated as a surface rubber layer 9 on the outer side in the tire widthwise direction and the tire radial direction of the intermediate tread region 8.
  • the surface rubber layer 9 is formed of rubber of which loss tangent is larger than that of the rubber constituting the intermediate tread region 8.
  • the surface rubber layer 9 may be provided only in one of the half-tread regions of the tread portion 3 (the half region on the right hand side in the example shown in Fig. 5 ).
  • test tires according to the present invention were produced and the running performances thereof were tested as described below.
  • Example 1 tire and Example 2 tire a tread portion thereof is constituted of five tread regions as shown in Fig. 3 and each tire is a pneumatic slick tire for a motorcycle, having tire size of 190/650R16.5, characteristics as shown in Table 1 and no grooves in the tread portion thereof.
  • the numerical values of loss tangent shown in Table 1 are relative values in which the loss tangent of the center tread region of the Example tires is converted to 100 as the reference value and the loss tangent at other tread regions are expressed relative to the reference value.
  • Conventional test tires 1 and 2 were produced as follows.
  • Conventional tire 1 has the structure as shown in Fig. 6 and the characteristics as shown in Table 1.
  • Conventional tire 2 has the structure as shown in Fig. 7 and the characteristics as shown in Table 1.
  • Each of the test tires was assembled with a rim having size of MT6.25 ⁇ 16.5, to be a tire wheel.
  • Each of the tire wheels thus obtained was mounted to a 1000cc racing motorcycle for use in the tests and the traction performance in running on a dry road surface and gripping performance were evaluated with applying an internal air pressure 220 kPa (a relative pressure) and a load of 2.0 kN to the tire.
  • the gripping performance in cornering situation was evaluated by feelings felt by a test rider and by comparing data of the vehicle speed and the slip rate measured by an analyzer mounted to the test vehicle, between a case where the camber angle was 45° or larger (i.e. the camber angel was relatively large) and a case where the camber angle was smaller than 45° (i.e.
  • Example 1 tire and Example 2 tire exhibit equivalent or improved cornering performance and significantly improved durability at a relatively high speed, as compared with Conventional Example 1 tire and Conventional Example tire 2.
  • cornering performance at a relatively small camber angle of Example 1 tire is slightly poorer than that of Comparative Example 2
  • durability at a relatively high speed and cornering performance at a relatively large camber angel of Example 1 tire have been significantly improved, whereby it is reasonably concluded that the tire performances in total of Example 1 tire have been improved. Therefore, as a whole, Example tire 1 and Example tire 2 have successfully made durability performance at a relatively high speed compatible at a satisfactory level with cornering performance.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

　トレッド部を構成するトレッドゴムの損失正接の分布を適正化することにより、コーナリング走行する際のグリップ性能を維持しつつも、直進走行する際の高速耐久性が向上している自動二輪車用空気入りタイヤを提供する。 　自動二輪車用空気入りタイヤは、ビードコアを埋設した一対のビード部１、ビード部１からタイヤ径方向外側に延びる一対のサイドウォール部２、及び両サイドウォール部２の間にまたがって延びるトレッド部３を具える。かかるトレッド部３は、タイヤ幅方向断面で見て、隣接する領域を構成するゴムの損失正接が相互に異なる、少なくとも４つのトレッド部領域から構成されており、トレッド部領域の内、タイヤ赤道面４を含むトレッド部領域である中央トレッド部領域５を構成するゴムの損失正接が、他のトレッド部領域６を構成するゴムの損失正接よりも小さいことを特徴とする自動二輪車用空気入りタイヤである。
EP07859837A 2007-02-01 2007-12-14 Tire for motorbike Not-in-force EP2108529B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007023047A JP4974695B2 (ja) 2007-02-01 2007-02-01 自動二輪車用タイヤ
PCT/JP2007/074163 WO2008093473A1 (ja) 2007-02-01 2007-12-14 自動二輪車用タイヤ

Publications (3)

Publication Number Publication Date
EP2108529A1 EP2108529A1 (en) 2009-10-14
EP2108529A4 EP2108529A4 (en) 2010-08-25
EP2108529B1 true EP2108529B1 (en) 2012-06-27

Family

ID=39673789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07859837A Not-in-force EP2108529B1 (en) 2007-02-01 2007-12-14 Tire for motorbike

Country Status (5)

Country Link
US (1) US8297324B2 (ja)
EP (1) EP2108529B1 (ja)
JP (1) JP4974695B2 (ja)
CN (1) CN101595001B (ja)
WO (1) WO2008093473A1 (ja)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008111556A1 (ja) * 2007-03-08 2008-09-18 Bridgestone Corporation 自動二輪車用空気入りタイヤ
JP4231085B1 (ja) * 2007-10-04 2009-02-25 株式会社ブリヂストン 自動二輪車用空気入りタイヤ
JP5322697B2 (ja) * 2009-02-26 2013-10-23 株式会社ブリヂストン 自動二輪車用空気入りタイヤ
JP5351627B2 (ja) * 2009-06-12 2013-11-27 住友ゴム工業株式会社 自動二輪車用タイヤ
FR2954223B1 (fr) * 2009-12-22 2016-01-01 Michelin Soc Tech Pneumatique ayant une bande de roulement perfectionnee
CN102666144B (zh) * 2010-01-26 2015-04-08 株式会社普利司通 机动两轮车用充气轮胎
US9776456B2 (en) * 2011-01-19 2017-10-03 The Goodyear Tire & Rubber Company Zoned tread for racing tires
JP5297485B2 (ja) * 2011-02-28 2013-09-25 住友ゴム工業株式会社 二輪自動車用ラジアルタイヤ
EP2537685A1 (en) * 2011-06-23 2012-12-26 Compagnie Generale Des Etablissements Michelin Tyre with improved tread
JP5868040B2 (ja) * 2011-07-01 2016-02-24 住友ゴム工業株式会社 二輪自動車用タイヤ
JP5548183B2 (ja) * 2011-12-29 2014-07-16 住友ゴム工業株式会社 自動二輪車用タイヤ
JP5462901B2 (ja) * 2012-03-16 2014-04-02 住友ゴム工業株式会社 自動二輪車用タイヤ
JP5711691B2 (ja) * 2012-05-08 2015-05-07 住友ゴム工業株式会社 自動二輪車用タイヤ
EP2878436B1 (en) * 2012-07-19 2018-11-14 Bridgestone Corporation Base tire manufacturing method
JP6320764B2 (ja) * 2014-01-24 2018-05-09 株式会社ブリヂストン 自動二輪車用タイヤ
JP6862775B2 (ja) * 2016-11-10 2021-04-21 住友ゴム工業株式会社 自動二輪車用空気入りタイヤ
JP6820013B2 (ja) * 2017-05-02 2021-01-27 株式会社ブリヂストン 二輪車用タイヤ
IT202200010961A1 (it) * 2022-05-25 2023-11-25 Pirelli Pneumatico per ruote di motocicli

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6094804A (ja) * 1983-10-31 1985-05-28 Yokohama Rubber Co Ltd:The 二輪自動車用タイヤ
JP3287774B2 (ja) * 1996-10-17 2002-06-04 住友ゴム工業株式会社 自動二輪車用タイヤ
IT1290083B1 (it) 1997-03-14 1998-10-19 Pirelli Pneumatico a bassa temperatura d'esercizio
BR0318518B1 (pt) * 2003-09-30 2012-08-21 pneu e processo para fabricar um pneu.
CA2491190C (en) 2004-02-03 2013-02-12 The Goodyear Tire & Rubber Company Tire with rubber tread of circumferential zones with graduated physical properties
JP4630096B2 (ja) 2005-03-15 2011-02-09 住友ゴム工業株式会社 自動二輪車用タイヤ
JP2006273240A (ja) * 2005-03-30 2006-10-12 Bridgestone Corp 自動二輪車用空気入りタイヤ
JP5110893B2 (ja) * 2007-02-01 2012-12-26 株式会社ブリヂストン 自動二輪車用タイヤ

Also Published As

Publication number Publication date
WO2008093473A1 (ja) 2008-08-07
CN101595001B (zh) 2013-05-08
CN101595001A (zh) 2009-12-02
US8297324B2 (en) 2012-10-30
EP2108529A4 (en) 2010-08-25
EP2108529A1 (en) 2009-10-14
JP2008189040A (ja) 2008-08-21
US20100132862A1 (en) 2010-06-03
JP4974695B2 (ja) 2012-07-11

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